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06-20-2005, 11:55 AM | #1 |
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Pros and cons of twin-scroll turbo!
I was looking at turbo the other day and I saw two(2) twin-scroll turbos for sale. One by PE and the other was a VF37. I was wondering what were the pros and cons of these turbos. Also the engine that the turbo would go on would either be a V7 EJ207 or a a Axis Motorsports 2.2L EJ20. Either way, the car is going to used for autocross and daily driver so response is what I am looking for.
Geran
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Last edited by Carisma; 06-20-2005 at 11:09 PM. |
06-20-2005, 11:09 PM | #2 |
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bumpity
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06-20-2005, 11:40 PM | #3 |
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better low end but limited top end
( limited turbo selection, few aftermarket parts) |
06-21-2005, 12:13 AM | #4 |
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Many, many replies to this topic if you do a search.
Interestingly enough my last dyno tune showed a healthy increase in top end compared to a similarly equiped STi with the stock VF39. Bottom was better too, but the increase past 5500 was more substantial. The PE and ZeroSports twinscrolls feature a larger turbine than the standard VF37 or VF36. |
06-21-2005, 12:38 AM | #5 |
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upside: spool and power
downside: availability and price |
06-21-2005, 01:38 AM | #6 | |
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06-21-2005, 05:42 AM | #7 | |
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06-21-2005, 10:07 AM | #8 |
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by the time you go w/ a twin scroll imo you'd be better off just throwing in a 2.5. run any turbo you want, or keep what youve got and have a ton of torque and mid range power.
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06-21-2005, 12:05 PM | #9 |
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Have you driven one? If not, don't make a decision based on dyno plots.
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06-21-2005, 01:52 PM | #10 |
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driven what???
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06-21-2005, 02:12 PM | #11 | |
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06-21-2005, 02:17 PM | #12 |
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lol oh, still what??? 2.5 or twin. im a big advocate of the 2.5 swap, cost is very similar to a full twinscroll setup.
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06-21-2005, 02:23 PM | #13 |
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http://www.xanga.com/home.aspx?user=deathinacan66
just got finished with my downpipe on my ej25 w/VF37. took a perrin 3 in downpipe, cut off the flange, welded on the stock jdm downpipe flange... filled in the gaps with welds. clocked at 0-60mph at 4.0sec, possibly faster. if you do this swap, make sure you get your clutch ready... the turbo spools so fast, and so aggresively, it takes an exedy stage 2 or 3 to keep the power to the wheels... oh, and forget about awd, with this much torque at the low end, its hella hard keeping the wheels from spinning. i'll try and get some video's to you, send me your email and i'll mail some to ya. lata bro. kory |
06-21-2005, 03:12 PM | #14 | |
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06-21-2005, 06:53 PM | #15 |
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No I haven't driven one yet. I am mainly looking for something wither good response since it would be used for autocross sometimes. I know the 2.5 swap has some good torque and everything but it is very pricey. Also I am looking for around 300-350whp and 290-300ft-lbs. of torque. Just let me know. If I did go Twin-scroll I would go with the PE1825 over the VF37 just because it can get a better top-end and still have some low-end grunt.
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06-21-2005, 07:05 PM | #16 |
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well your not gonna see 350 whp out of a twin scroll, never.
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06-21-2005, 07:07 PM | #17 |
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well i shouldnt say never but you get the point, no turbo that i know of that would still be in its effiency range. maybe gt32
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06-21-2005, 11:11 PM | #18 |
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I am mainly looking for around 300whp, I know 350whp is pushing anything that comes stock on any car.
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06-22-2005, 01:53 PM | #19 |
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never? come drive in my car. i'll get you the dyno numbers as soon as i get my car tuned.
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06-22-2005, 02:23 PM | #20 | |
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06-22-2005, 02:37 PM | #21 | |
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I agree with your comment of a 2.5 being a better decision though. If you want 300whp, then the 37 should be able to achieve that.twinscroll setups are VERY responsive and they just straight up sound sick. very much like a twin turbo 6 cylinder(supra, skylines). Also from my experience, the motor just feels healthier and smooth-revving |
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06-22-2005, 03:42 PM | #22 |
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I have a USDM 2.0L WRX with a VF-37 setup. Dyno plots dont' really explain how fast the power comes on when you floor the turbo from a roll. I made 267 whp on KTR's heart breaker dyno with this setup. For reference a stock STi makes 210-215 whp. The area under my power curve is fat ass hell also.
The Larger compressor wheel (pe turbo, or Deadbolt clone) will slow your spool somewhat.... but even my tuner said the compressor housing was a little small and i could easily see signifigant gains across the board with a larger compressor. I'm not gonna reccomend you go twinscroll tho....I did it just to be different - if everyone else started doing it they'd all realize how much it rocks and then i wouldn't be the only one around anymore :-P -J |
06-22-2005, 03:44 PM | #23 |
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Oh yea.. You lose the subaru rumble... The sound - while not as cool - is very pleasing to the ears. It sounds (at least with my exhaust setup) something like an evo on roids.
-J |
06-22-2005, 03:55 PM | #24 |
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can some one link to someone that sells the vf37 setup?
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06-22-2005, 04:23 PM | #25 |
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iaperformance.com can usually get them. Just hitup stephan... he's the best. he'll get you a full setup for somewhere south of 1700... while rallispec wants north of that for just the components (not including the turbo). Stephan also gave me a killer deal on my v8 seats 8)
-J |
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